IMPACT/RELEVANCE: In 2008, Alberta invested significant research funds to establish pregnancy and birth cohorts that will help develop knowledge needed to improve the health of mothers and infants. Answering health questions about developmental effects requires continued contact and follow-up with the participants every 3-6 months, which is a significant challenge, and one which most international cohorts are struggling to accomplish with paper questionnaires. What the investigators propose in this grant is to evaluate a novel approach to complex longitudinal research that enables data collection that is convenient, less burdensome, and efficient for participants. The investigators expect that the ePRO system will: 1) increase completion rate by tracking participant progress in the study, notifying them when it is time for another round of questionnaires, administering questionnaires in an efficient manner (skip non-relevant questions), and sending reminders about incomplete questionnaires, and 2) improve data quality by alerting participants to missing items.